Imports of oci-image-tool command

PathSynopsis
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/opencontainers/image-spec/image
github.com/opencontainers/image-spec/schemaPackage schema defines the OCI image media types, schema definitions and validation functions.
github.com/pkg/errorsPackage errors provides simple error handling primitives.
github.com/spf13/cobraPackage cobra is a commander providing a simple interface to create powerful modern CLI interfaces.
ioPackage io provides basic interfaces to I/O primitives.
io/ioutilPackage ioutil implements some I/O utility functions.
logPackage log implements a simple logging package.
net/httpPackage http provides HTTP client and server implementations.
osPackage os provides a platform-independent interface to operating system functionality.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.